elizabeth palmer reports scotland yard's two top officials have resigned and one of rupert murdoch's closest associates was arrested. the debt battle. a new cbs news poll shows democrats and republicans are paying a price for the drownout talks. norah o'donnell and nancy cordes have that. it is bone dry across america's heartland. maya rodriguez tells us this year's heat and drought are making history. and mark strassmann on the next race for space. four private companies are competing to a build successor to the shuttle. we'll give you a glimpse of the future. captioning sponsored by cbs this is the "cbs evening news" with scott pelley. >> schieffer: good evening, scott's off tonight. i'm bob schieffer. the tabloid phone hacking and police bribery scandal in great britain is growing wider, deeper and more mysterious by the minute. the prime minister cut short an overseas trip to return home. he will address parliament about it. the original whistle-blower was found dead, unexplained causes so far. the top man in scotland yard resigned yesterday and today the yard's number-two man wa